20820920

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{67}}^1\times {\mathrm{457}}^1$

素因数の和:552

約数の個数: 64

約数和(自身を含む): 50453280

約数和(自身を除く): 29632360

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 67, 68, 85, 134, 136, 170, 268, 335, 340, 457, 536, 670, 680, 914, 1139, 1340, 1828, 2278, 2285, 2680, 3656, 4556, 4570, 5695, 7769, 9112, 9140, 11390, 15538, 18280, 22780, 30619, 31076, 38845, 45560, 61238, 62152, 77690, 122476, 153095, 155380, 244952, 306190, 310760, 520523, 612380, 1041046, 1224760, 2082092, 2602615, 4164184, 5205230, 10410460, 20820920]

約数ペア:

[(1, 20820920), (2, 10410460), (4, 5205230), (5, 4164184), (8, 2602615), (10, 2082092), (17, 1224760), (20, 1041046), (34, 612380), (40, 520523), (67, 310760), (68, 306190), (85, 244952), (134, 155380), (136, 153095), (170, 122476), (268, 77690), (335, 62152), (340, 61238), (457, 45560), (536, 38845), (670, 31076), (680, 30619), (914, 22780), (1139, 18280), (1340, 15538), (1828, 11390), (2278, 9140), (2285, 9112), (2680, 7769), (3656, 5695), (4556, 4570)]